iMac G5/1.8 20-Inch

The iMac G5/1.8 with the 20-inch display is identical to the iMac G5/1.8 with the 17-inch display. It is the all-in-one desktop computer in a polycarbonate casing behind the 17” screen, mounted on an aluminum stand. The casing is approximately 2 inches deep and it can also be mounted on a wall or kiosk, for it meets the VESA standards. The iMac G5/1.8 17-inch features a 1.8 GHz PowerPC 970 (G5) processor with an optimized AltiVec “Velocity Engine” vector processing unit, 256 MB of SDRAM, a 160 GB Serial ATA hard drive (7200 RPM), a slot-loading 4X “Super” Drive, NVIDIA GeForce FX 5200 Ultra graphics with 64 MB of DDR SDRAM (AGP 8X), and built-in stereo speakers, as well as 2 Firewire “400” and 3 USB 2.0 ports. It also supports AirPort Extreme (802.11g) and Bluetooth, but the cards are optional and installed at the factory. The cooling system is CPU controlled and the in-built speakers are mounted beneath the 17inch screen for the sound to bounce off the desk or other surface. The speakers’ grills also work as the vent ones. The iMac G5/1.8 is shipped with Apple Keyboard and Apple mouse from the box.

iMac G5/1.8 20-Inch

Introduced on: August 31, 2004.


  • Codename: “Hero”.
  • Processor Speed: 1.8 GHz.
  • Processor Architecture: 64-bit.
  • Processor type: PowerPC G5 970fx (POWER4).
  • Processor upgrade: Soldered.
  • Cores: 1.
  • On-Board Ram: 256 MB, DDR 400MHz.
  • Video: 20″ TFT active matrix LCD, 1440 x 900/1680 x 1050 pixels max resolution, viewing angle: 120° horizontal and 90° degrees vertical.
  • Graphics: nVidia GeForce FX 5200 Ultra with 64 MB of DDR SDRAM.
  • Storage: 160 GB, 7200-rpm Ultra ATA-66 up to 128 GB Hard Drive Supported.
  • Input\Output: 3x USB 2.0, 2x Firewire 400, built-in microphone, built-in speakers, audio out, audio input/output. Optical drive: 4X “Super” Drive.
  • Internet \ Wireless connection: Optional 54 Mbit/s AirPort Extreme 802.11b/g, 10BASE-T/100BASE-TX Ethernet, 56k V.92 modem, Optional Bluetooth 1.1.
  • OS: Preinstalled OS: 10.3.5. OS max. upgrade: 10.5.8.
  • Dimensions: 18.6 x 19.4 x 7.4 inch.
  • Weight: 25.2 lb.

Apple Orders, Discontinuation, Price

Apple Model No: A1076 (EMC 2008).

Apple Order number: M9250LL/A.

Discontinued: May 3, 2005

Price: $1899.


  • The iMac G5 stand has and adjustable hinge. The Apple iMac G5/1.8 20” was introduced in line with the iMac G5/1.6 17” and iMac G5/1.8 17”.

Customizing Desktop and Setting Preferences

You can quickly make your desktop look the way you want using System Preferences. To customize your desktop Choose Apple Menu > System Preferences from the menu bar. Feel free to make changes and experiment with the following:

  • Desktop & Screen Saver: Select this preference pane to change the background color or pattern of your desktop, or change it to a photo or image you like. You can also choose an eye-catching screen effect that will appear on your screen when the computer is left idle.
  • Dock: Select this preference pane to change the look, location, and behavior of your Dock.
  • Appearance: Select this preference pane to change the colors of buttons, menus, windows, and highlight colors, among other options.

As you get to know your computer, explore the other System Preferences. It is your command center for most settings on your iMac G5. For more information, open Mac OS Help and search for System Preferences or for the specific preference you want to change.

Keeping Software Up to Date

You can connect to the Internet and automatically download and install the latest free software versions, drivers, and other enhancements from Apple. When you are connected to the Internet, Software Update checks Apple’s servers to see if any updates are available for your computer. You can set your Mac to check the Apple server periodically and download and install updated software.

To check for updated software:

  1. Choose Apple Menu > Software Update. The Software Update window opens. If there are any updates available, they appear in a list.
  2. Click the checkbox to select the items you want to install, then click Install. Type an administrator name and password (the name and password you used when you first set up your computer).

When the updates complete, Software Update checks for updates again. It does this because some updates require that you have installed previous updates. For more information, search for Software Update in Mac OS Help.

Connecting to a Network

If you want to connect your iMac G5 to an Ethernet network, cable or DSL modem, or a wireless network, see “Ethernet (10/100Base-T)” and “AirPort Extreme Wireless Internet and Networking” for more information about setting up an Ethernet or AirPort connection. Also open Mac OS Help and search for “Ethernet” or “AirPort” for further help.

Using the Internet

When you first set up your iMac G5, you were instructed on how to connect to the Internet. If you need to change to a different type of connection, such as a DSL or cable modem, Ethernet local area network (LAN), or AirPort Extreme network, you can find more information in Appendix C, “Connecting to the Internet”.

Transferring Files to Another Computer

You have several ways to transfer files or documents to or from your iMac G5.

You can easily transfer files using the Setup Assistant. To do this, proceed as follows:

  • You can transfer files via the Internet using .Mac or another Internet account.
  • If your computer is connected to an Ethernet network, you can transfer files to another computer on the network. To access another server or computer, open a Finder window and click Network. Or if you know the name or network address of the computer, choose Go > Connect to Server from the Finder menu bar.
  • You can create a small Ethernet network by connecting an Ethernet cable from your iMac G5 to another computer’s Ethernet port. For more information, open Mac OS Help and search for Connecting two computers.
  • You can also connect to another Mac using a FireWire cable. Your iMac G5 appears as a disk drive on the other computer and you can transfer files. For information about using FireWire to transfer files, see FireWire Target Disk Mode.
  • If the iMac has an AirPort Extreme Card, you can connect to an AirPort wireless network to transfer files. For more information, see AirPort Extreme Wireless Internet and Networking.


  • If you want to switch to a newer model, you can always sell your old iMac to iGotOffer. Best prices online, free instant quote, free fully insured shipping, Fast Payment: Sell iMac.
  • iMac G5/1.8 17-Inch is the all-in-one desktop computer in a polycarbonate casing behind the 17” screen, mounted on an aluminum stand.


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